Electric cable.



R. F. HALL.

ELECTRIC CABLE.

APPLXOATION FILED JULY 24, 1905.

Patented May I, 1910.

Mvmwwwq about every two hundred cise, and exactdescription.

UNITED STATES PATENT FFICE.

.RODERIC F. HALL, oF EAST ORANGE, NEW JERSEY. Assiono'n To WESTERN ELECTRIC COMPANY, F CHICAGO; ILLINOIS, A CORPORATION OE' LLINOIS.

ELECTRIC CABLE Specification of Letters atent.

Patented Hay 10,1910.

To all when 'it ma?) concern:

Be it known that l, Roni-:ino lf. lian., citizen of-the United Statesresidiing at last Orange, in the county of Essex and State ot New Jersey, have invented a certain new and useful Improvement in Electric Cables, of which the following' is a full, clear, con- My invention relates to electric cables of the class in which the conductors are niade up in pairs formed into a core in layers, the two-wires of a pair coiistitutiim,- the two `sides eta metallic circuit.

The object of my invention is the-production of a cable in which a balance in lapaeiJ-y is preserved and inwhieh the relations tween the 'arious conductors are such that for all practical purposes there will be no inductive action between the various circuits,y thus eliminating vindruetive disturbA ances,'sueh, tor example, as eros talk, when the cable is usedt'or telephone purposes.

Briely,`my invention consists in transposing the twisted pairs forming the metallic circuits atintervals so as to cli nge their relative positions, sucli transposititlis inadedaring 4the nmanufactuife et' the cable at desired intervals in the continuous cable length and not merely zt the junction point of said lengths.

My invention therefore comprises a cable, as an article of manufacture, having; pairs tra-fisposed with reference tof each other at certain intervals in the cable length.

It isnotnecessary to make such transnosi tions except, for exam-ple, at intervals and titty feet. The pairs are so transposed that, no

pairs are adjacent except for this short. distance. l'l'eiiee if one pair should come under the inductive intluence of anotliei, this influence would be destroyed by the elif-inge in their relative positions. The tivo'ivires forming each pairv may lie 'twisted in a series of lays'lisving a variable twist, and prefer to torni the core of pairs twisted suchinanner. A eable made up of such pairsis less subgect to inductive nisturl'ian'ces than I the ordinary cables, there being'- less l hood ot the wires of one pair coming into 'parallel relation withv the wires oit ano-ther pair. When, as an additional precaution,

the continuons: mii-s are also transposer ai l certain intervals the possibility of inductive disturbance is practically removed.

l will describe in v invention more particu-- larly b v reference to the aecon'ipanying drawings, in wliich- Figure l a perspective view of a cable section with a portion oi tlielinclosing sheath removed and the wires separated to show more clearly .the transposition thereof in lsaid section. Fig. Q is a diagrammatic View showing` the transposition oi" the pairs et' wires with reference to each other. Fig. El is a diagrammatic view showing a pair ot wires twisted with a variable lay, in accordance with my invention,

The core of the cable A is composed of a with a variable twist, so as'to forni a series ot lays between'llie noties c.

The length ot' "st o'adnally incre: 'es troni one node' o to um die n s of lays, having v L peated sucer sivelj,y lliioi hout the L 'i the pair. ll do not or v4n to limit lin vseli to any particular kind variable lay. how ever. and the length et t.. lav the length oit the longest and slmrte.Y and relative arrangement, ol die twists in` each lav. obviously ma lie va'riedas de The? transpo.. ion et tlie pairs diagraiamatically in Fi Here a layer having fourteen pairs lr s one. halt of its pairs sl'iitted over other 1n s at a particular point in the cable lengths. ils a result no two pairs nfliich Y\':ere .adjacent betere the tr:.=.nsi iosition att. .vard continue in suoli relative positions. liter example, pair 5l, which, prior to the trlnspositiini. was tween pairs 2 and fi, is

Witii relation to each t volving doctors.

fri.

e tvfistii i* of the wires in variable. .lays to up parallelism between the ruiters or aclaeent pairs, and the transpluralit;T ot' pairs ot wires B, each formed or lOtl FTI

.cient amount of parellelismhas developed electric cable made up of insulated contintwisted with a Variable ley, and the several lo pairs being transposed with reference to euch other ut intervals in their continuity.

In Wit-ness whereof, I hereunto subscribe my nume this 14th day of July A. D., 1905.

RODERIC F. HALL.

W'ituesses Dr, 'Wrr'r C. TANNER, GEORGE E. FOLK.

position removes a pair from its posit-ion between two ad]aeent pairs before a sutilto 'produce' cross-talk. g

Having thus described my irvention, what I claim is:

An article of manufacture comprising nu nous wires twisted in pairs, eaeh pair being 

